Caterpillars December 31st, 2015 balance sheet shows accounts receivable of approximately $9 billion, accounts payable of approximately $4.5 billion, and an inventory of approximately $5 billion. Their 2015 income statement shows Cost of Good Sold (COGS) of approximately $20 billion, sales of approximately $27 billion, and operating costs of approximately $22.5 billion. How long, on average, are Caterpillars payments outstanding? Assume a year has 360 days. Please provide a process flows diagram as well.

A) 72 days

B) 120 days

C) 90 days

D) 4 times per year